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Continuously water-logged soils are disadvantageous for plant growth. Why?
 
Water-logged soil produces less for plants to respirate and affects their growth.

The primary function of includes water absorption and uptake of oxygen from the pore space of the soil.
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In ordinary soil, oxygen from the pore spaces moves into the .​

However, water occupies the between soil particles and pushes the out into the atmosphere in water-logged soil. 

So, continuously water-logged soils are disadvantageous for growth.